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Add note on pattern detector

This commit is contained in:
Eddie Hung 2019-10-05 08:53:01 -07:00
parent 6c5e1234e1
commit ebb059896a
1 changed files with 7 additions and 3 deletions
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10
passes/pmgen/xilinx_dsp.pmg
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@ -44,9 +44,13 @@
// DSP48E1 cells inferred from multiply operations by Yosys, as well as for // DSP48E1 cells inferred from multiply operations by Yosys, as well as for
// user instantiations that may already contain the cells being packed... // user instantiations that may already contain the cells being packed...
// (though the latter is currently untested) // (though the latter is currently untested)
// - Since the $dff-with-clock-enable-or-reset-mux pattern is used for each // - Since the $dff-with-optional-clock-enable-or-reset-mux pattern is used
// *REG match, it has been factored out into two subpatterns: in_dffe // for each *REG match, it has been factored out into two subpatterns:
// out_dffe located at the bottom of this file // in_dffe and out_dffe located at the bottom of this file.
// - Matching for pattern detector features is currently incomplete. For
// example, matching for underflow as well as overflow detection is
// possible, as would auto-reset, enabling saturated arithmetic, detecting
// custom patterns, etc.
pattern xilinx_dsp_pack pattern xilinx_dsp_pack